纵扭超声磨削ZrO_(2)陶瓷表面形貌及粗糙度特征研究

Study on Surface Morphology and Roughness Characteristics of ZrO_(2) Ceramics Longitudinal Torsional Ultrasonic Grinding

ZrO_(2)陶瓷作为典型硬脆材料,采用普通的磨削方法难以获得良好表面质量,而超声振动磨削可显著改善其加工效果。本文将纵扭超声振动应用于磨削加工,运用单因素法,设计普通磨削(OG)及纵扭超声磨削(LTUG)对比试验,以加工后材料表面粗糙度R_(a)值和微观形貌作为评价指标,分析并得到各工艺参数对表面质量的影响规律。结果表明:整体上LTUG表面R_(a)值始终低于OG,且磨削表面平整,磨痕形貌更加均匀、顺畅;相比于OG,随超声能量增大,LTUG表面R_(a)值呈先减小后增大趋势,同时均随磨削深度加深先减小后增大,随主轴转速提高均逐渐降低;另外,OG表面R_(a)值随进给速度提升先增大后减小,而LTUG为持续增大并逐渐趋向OG。

As a typical hard-brittle material,ZrO_(2)ceramics is difficult to obtain good surface quality with ordinary grinding methods.However,ultrasonic vibration grinding can significantly improve its machining effect.In this paper,longitudinal torsion ultrasonic vibration is applied to grinding,and the comparison test of the ordinary grinding(OG)with the longitudinal torsion ultrasonic grinding(LTUG)was designed with single factor method.The surface roughness R_(a) value and microstructure of processed materials were used as evaluation indexes.The influence law of each technological parameter on the surface quality is analyzed and obtained.The result shows that the surface R_(a) value via LTUG was always lower than that via OG,and the grinding surface was more uniform and smooth;comparing with OG,R_(a) value via LTUG decreases firstly and then increases with the increasing of ultrasonic energy,and at the same time,they both decrease firstly and then increase with the increasing of grinding depth,and decrease gradually with the increasing of spindle speed;in addition,the surface R_(a) value via OG increases firstly and then decreases with the increasing of feed speed,while the LTUG increases continuously and gradually approaches OG.